Why Dropwise Condensation Is Preferred?

Under certain conditions, dropwise condensation provides for much higher heat transfer rates than filmwise condensation. Although a drop has a larger surface area than a film occupying the same surface area, this difference is relatively small.

Why is dropwise condensation more efficient than film wise condensation?

Dropwise condensation occurs when a vapor condenses on a surface not wetted by the condensate. For nonmetal vapors, dropwise condensation gives much higher heat transfer coefficients than those found with film condensation.

Which type of condensation is more effective?

The moving droplet devours the droplets of smaller size. Dropwise condensation is one of the most effective mechanism of heat transfer and extremely large heat transfer coefficients can be achieved with this mechanism.